feat(plat/imx8m): add sdei support for i.MX8MN

Add sdei support for i.MX8MN, this is to let jailhouse Hypervisor
could use SDEI to do hypervisor management, after physical IRQ
has been disabled routing.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Change-Id: Ie15fffdd09e1bba1b22334b8ccac2335c96b8b4d

plat/imx/imx8m/imx8mn/include/platform_def.h

@@ -34,6 +34,11 @@
 #define PLAT_WAIT_RET_STATE		U(1)
 #define PLAT_STOP_OFF_STATE		U(3)
 
+#define PLAT_PRI_BITS			U(3)
+#define PLAT_SDEI_CRITICAL_PRI		0x10
+#define PLAT_SDEI_NORMAL_PRI		0x20
+#define PLAT_SDEI_SGI_PRIVATE		U(9)
+
 #define BL31_BASE			U(0x960000)
 #define BL31_LIMIT			U(0x980000)
 

plat/imx/imx8m/imx8mn/platform.mk

@@ -31,6 +31,8 @@ BL31_SOURCES		+=	plat/imx/common/imx8_helpers.S			\
 				plat/imx/common/imx_sip_handler.c		\
 				plat/imx/common/imx_sip_svc.c			\
 				plat/imx/common/imx_uart_console.S		\
+				plat/imx/common/imx_ehf.c                       \
+				plat/imx/common/imx_sdei.c                      \
 				lib/cpus/aarch64/cortex_a53.S			\
 				drivers/arm/tzc/tzc380.c			\
 				drivers/delay_timer/delay_timer.c		\
@@ -54,3 +56,6 @@ $(eval $(call add_define,BL32_SIZE))
 
 IMX_BOOT_UART_BASE	?=	0x30890000
 $(eval $(call add_define,IMX_BOOT_UART_BASE))
+
+EL3_EXCEPTION_HANDLING := 1
+SDEI_SUPPORT := 1